# std::chrono::day

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< cpp‎ | chrono

Defined in header `<chrono>` |  |
class day; |  | (since C++20)

The class `day` represents a day in a month. Its normal range is `[`1`,` 31`]`, but it may hold any number in `[`​0​`,` 255`]`.

`day` is a TriviallyCopyable StandardLayoutType.

### Member functions

(constructor) | constructs a `day` (public member function)
operator++operator++(int)operator--operator--(int) | increments or decrements the day (public member function)
operator+=operator-= | adds or subtracts a number of days (public member function)
operator unsigned | retrieves the stored day value (public member function)
ok | checks if the stored day value is in the normal range (public member function)

### Nonmember functions

operator==operator<=> (C++20) | compares two `day` values (function)
operator+operator- (C++20) | adds or subtracts a number of days and a `day`, or find the difference between two `day`s (function)
operator<< (C++20) | outputs a `day` into a stream (function template)
from_stream (C++20) | parses a `day` from a stream according to the provided format (function template)

### Helper classes

std::formatter<std::chrono::day> (C++20) | formatting support for `day` (class template specialization)
std::hash<std::chrono::day> (C++26) | hash support for `std::chrono::day` (class template specialization)

### Literals

Defined in inline namespace `std::literals::chrono_literals`
operator""d (C++20) | a std::chrono::day literal representing a day of a month (function)

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